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Unread 10-19-2009, 08:26 AM   #1
TSWisla
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need to waterproof shower...

Hello, haven't been here in a while. I started a shower project 3 years ago and finally am ready to continue! I need to waterproof the hardiboard I have up, but am not sure what direction to go. I have 2 buckets of hydroban in my basement that I am afraid to use because it is over 3 years old (ouch!). I am wary of Redgard because it is from HD. I fear these roll-on membranes because I think it will peel off at some point (am I nuts?). The Kerdi sounds great, but how the heck do you imbed it? Just push it on or do you squeegee the mortar (how do you get the air out?)? I really need some advice here. Thank you in advance.

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Unread 10-19-2009, 08:40 AM   #2
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Quote:
Originally Posted by Laticrete's Hydroban Datasheet
Factory sealed containers of this Hydroban are guaranteed to be of
first quality for two (2) years if stored at temperatures >32°F (0°C)
and <110°F (43°C).
Looks like you have something for Hazardous Waste Collection Day!

Redgard is fine if used according to Custom's directions. HD has nothing to do with it. Thickness counts. I recommend getting a wet film thickness gage (paint stores have them) so you can check as you apply. Two coats are required, each between 35 and 40 mils thick when wet.

Kerdi is installed similarly to wallpaper. Apply the thinset to the wall, hold up the Kerdi to position it, then press the mat into the thinset with the flat edge of the trowel. Draw the trowel from top to bottom, and from center to edge. Some use a pair of drywall knives to seat the mat into the thinset, especially in corners.
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Unread 10-19-2009, 08:47 AM   #3
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Tom, kerdi is a great way to go. You might want to get JB's Kerdi ebook. Will answer just about any questions you may have...or we can help too. There is a link to it in my signature.
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Unread 10-19-2009, 08:53 AM   #4
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Thank you for the reply, yes, I have a lot of waste on my hands now!

If I do go with the kerdi, I have 2 niches that I recessed into the hardibacker so that they are installed over the hardibacker, flush with it. I put silicone sealer behind the niche between it and the hardibacker. How should the kerdi be installed over the niche? Does the kerdi need to go over the edge of the niche or do I just cover it where it is even with the wall?

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Unread 10-19-2009, 09:01 AM   #5
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Hi Tom,

If it were me I'd go with the Kerdi. You'll find lots of help here to get you the answers you need. If you already have a regular clamping drain in place there is an adapter drain available so you won't have to rip up too much of what you've already done.

Installing Kerdi is pretty straightforward. Dampen the substrate and use unmodified thinset (Kerabond is a good choice, DitraSet is even better). Lay the Kerdi on the thinset and working from the center out use the flat side of the trowel or a drywall joint knife to smooth it out and embed it in the thinset.

Schluter's web site has a lot of great information and videos of how it all works.
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Unread 10-19-2009, 09:04 AM   #6
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Niches get completely covered with Kerdi. All seams require a 2" overlap, typically done with KerdiBand.

There is a pattern that can be used to cut a single piece of Kerdi to fit a niche and provide the proper overlaps. I believe we will be posting it in the Liberry soon.
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Unread 10-19-2009, 09:32 AM   #7
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One more question regarding the niche. It is plastic (ABS?). I will join it to the hardiboard with tape, but will the thinset adhere to the plastic? Do I use thiset to tile the plastic as well?
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Unread 10-19-2009, 10:41 AM   #8
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I looked at the bag of thinset that I have and plastic is not listed as an approved surface. Any advice would be appreciated, please. Thank you.

Tom
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Unread 10-19-2009, 10:47 AM   #9
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Who made your niche, Tom? Most pre-manufactured niches are meant to be tiled over, so they should be thinset friendly.
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Unread 10-19-2009, 10:48 AM   #10
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It does not say, I just bought it at a tile store. The big one for shampoo is yellow and the smaller one for soap is red. So you think that tape and thinset should be fine then?
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Unread 10-19-2009, 10:52 AM   #11
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Also, what brand of thinset do you have? I hope it hasn't been sitting around as long as the Hydroban!
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Unread 10-19-2009, 10:53 AM   #12
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Can you post a picture of the niches you've got?
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Unread 10-19-2009, 10:54 AM   #13
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I dunno. Can you check with the tile store to see who made them? Granted, the store shouldn't sell them if they weren't made for tile, but I'd want to be sure. The manufacturer may have some special requirements that we need to be aware of.
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Unread 10-19-2009, 10:58 AM   #14
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I will try to get some pics up. I am wary of any advice from the people at the tile store, I get a different answer from as many people as I talk to.
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Unread 10-19-2009, 10:59 AM   #15
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Quote:
Originally Posted by Tom
I am wary of any advice from the people at the tile store...
But, somehow you are comfortable taking advice from some strangers you met on the Internet...
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